(1) One step beyond casual friday - Going to work unwashed in dirty clothes
(2) A work place dominated by unclean, unwashed co-workers
(3) A remote work location such as Alaska

Jimmy: "Have you been out to the field office?"
Jack: " Yeah it's totally hygiene optional with that crew - especially the chick"
Jimmy: "What are you talking about - she has most of her teeth"
Jack: "Yeah - in a JAR!"